Warp-stop mechanism for looms



Jan. 7, 1930. J, MccARVEY 1,742,776

WARP STOP MECHANISM FOR LOOMS Filed April 9, 1929 Ar TO RNE Y PatentedJan. 7, 1930 UNITED STATES PATENT oFricE J'UHUS ,MCQAIRVEY, OJ! ATLANTA,GEORGIA, ASSIGNOR TO DRAPER CORPORATION, ,OFjHOPEDAIIE, MASSACHUSETTS, ACORPORATION OF MAINE WARE-STOP "MECHANISM FOR LOOMS Arnhem/unifie ApThisrinventionnelates to warpstop mechaior .leolns and. moreparticularly Idilieeted to warp stop mechanisms ofthe transwersely,lmowsable toothed detector bar type wherein-the detector bar is ,givenits transverse movements dram the actuator through a drink cennectiontherewith.

It is inoiw the :ordinary practice to provide farlil'ik cormectionbetween the actuator and the transversely movable detector bar, and the:1-i-nk,-is usually pivoted to the actuator and has an open slot in itsopposite end for engagement vwitha pin or projection extend- :laterallyitem .the transversely movable detector $193!,-

:It sfrequently i happensiduring weaving or mani-pulatiomof theioom Zbythe attendant, -that..one -or more of {the :detecting bars may becomeaccidentally :detached from its link connection with itsadtuator,because the link is connected-to the connector bar by an open .slot andmay be readily, through accident .or otherwise, detached therefrom.Should this occur :and the loom besta-rted, the detector bar thusdetached from its actuator would fail to fiunction, with .the resultthat .no detection ot .a warp ,fault in the series of 'drop wiresassociated with xsuch detector :bar would occu r andtimperdieet clothisIiablc :to .be woven.

One of-the important iieatures of the present invention thereforeresides in a simple :but efiective lock ator securing the detector fbarto'the link connection between the bar and its actuator, so :thataccidental detach-- mentof the link from the detector bar is prevented,and when intentionally detached the 'ilockkitself will signal thefactthat'the parts are disconnected.

The invention and novel features thereof --will -best 'be made clearfrom the "following description when :read in connection with theaccompanying drawings showing one good form thereof. I

In ithe drawing Fig. 1 is a side elevation of one end of a warp stopmechanism containing the present invention;

h ema i n of 1929. Serial No. 353,826.

disassembled parts which more particularly include the presentinvention;

Fig. v3 is a perspective view showing the pasts of Fig. 2 in theiroperative position; an

Fig.4 is a side view of the connector link and lock with parts insection.

The locking connection between the trans versely movable detector barand its actuator may be advantageously employed in any usual form ofthis type of warp stop mecha-. nism, but, as indicated in Fig. 1 forillustrative purposes, the warp stop mechanism is of the general typeshown in the patent to Davis and Johnson, No. 1,538,625, dated May 191925.

As more fully described in the patent mentioned, the warp stop mechanismcomprises the end supports or brackets 1, one at each side of the loom,between which extend the warp rests or spacing bars 2. Mounted in abracket 3 extending from .one of the side supports is the rock shaft 4to which is connected the arm 5 which may be actuated through a link 6and rod 7 from any convenient going part of the loom, as, for instance,a cam on the lower or cam shaft, as usual. Mounted upon the rock shaft 4is the rocker 8, of which there may be any suitable number correspondingto the number of banks of drop wires employed, and mounted upon therocker 8 is the actuator 9 having pins 10 which rest in seats in therocker 8 under the influence of a spring 11 normally acting as set forthand more fully described in the patent to which attention is abovedirooted, to maintain the actuator and rocker in operative relation andyet permit the actuator to come to rest when the transversely movabletoothed detector bar to which it is connected is arrested on theoccurrence of a warp fault.

Pivotally mounted on the rocker at 12 is a finger 13 connected at 14 tothe actuator, the construction being such that should the actuator bearrested while the rocker continues to move, the outer end portion ofthe finger 13 will be depressed and act through a train of mechanism toeffect loom stoppage. In the present instance of the invention thefinger 13 acts upon an arm 15 which rests upon the upper end portion ofa plunger 16 associated with a flexible sheathed wire 17 which upon theoccurrence of a warp fault is moved longitudinally, as more fullyexplained in the Davis and Johnson patent, to effect loom stoppage. Itis not necessary herein to further describe the particulars of the warpstop mechanism in detail since these are all fully described in saidpatent and the details of such mechanism form no essential part of thepresent invention.

Extending between the side brackets or supports 1 of the warp stopmechanism is the transversely movable detector bar 18, provided with aseries of teeth 19, and associated with the movable detector bar is therelatively fixed toothed detector bar 20 which may be convenientlysupported in the upper portion of the side brackets 1 of the warp stopmechanism, as more fully described in the above-mentioned patent, and asgenerally indicated at 21, Fig. 1.

In warp stop mechanisms of the transversely movable detector bar type,the movable detector bar is provided with a lug or projection forengagement with the link connection between the movable detector bar andactuator, and these parts may be variously contrived, but, as indicatedin the present instance of the invention, the fixed detector bar has anopen slot 22 in which may slide the pin or projection 23 secured to themovable detector bar 18.

In. the present instance of the invention, the pin or projection 23 hasa head portion 24 and a shank portion 25, and also a reduced portionthat is secured to the detector bar 18 by the nut 26. The details ofthis construction, however, may be varied to suit conditions of use.

Pivotally mounted upon the actuator 9 at 27 is a link member 28preferably formed substantially as an inverted U-shaped member, as shownin the drawing, to pass above and straddle the upper portion of theadjacent side support or bracket 1. At its opposite end the link 28 isprovided with a notch or socket 30 conveniently formed in the downwardlyextending leg 29 of the link 28. The socket has the side portions 31which, when the link moved into engagement with the pin 23 of thetransversely movable detector bar, straddle the shank 25 of the pin,with the result that the actuator will transmit to the movable detectorbar its transverse detecting movements.

As above indicated, the present invention is directed to locking meanstor locking the swinging link in operative engagement with thetransversely movable detector bar. In the embodiment of the inventionillustrated in the drawing, the locking member 33 is pivotally mountedupon the downwardly extending portion 29 of the link by the pivot pin 34and the locking member is mounted in the slot 35 as will be apparentfrom the drawing.

The locking member illustrated is provided with the foot portion 36adapted to extend across the entrance of the socket 30 when the lockingmember is rocked to its locking position, best shown in Fig. 4. When theparts are in this position the foot 36 lies beneath the pin and preventsthe link 28 from being swung upwardly out of engagement with the pin 25.The locking member 33 is preferably provided with an upwardly extendingend or handle 37 which may be readily grasped to shift the lockingmember to and from its locking position, and this handle serves also asa signal adapted to show whether the locking member is in its lockingposition, since the loom attendant may determine by glancing at thehandle 37 whether the link 28 is locked to the pin 25.

In many cases it is desirable to positively retain the locking member 33in its active or pin-engaging position of Fig. 4c, and the presentinvention further contemplates locking means for positively holding thelocking member 33 in its active position. While such locking means maybe variously constructed it is shown as consisting of a blade 38 one endof which is seated in a notch 39 formed in the upper face of the link 28and the opposite end of which may be engaged with a notch 40 formed inthe handle 37, the arrangement being such that the outer end of theblade 38 may be shifted laterally slightly out of engagement with thehandle 37 as will be apparent from Fig. 2, to permit movement of thelocking member 33 to the inactive position of Fig. 2. The notch 39 maybe constructed to snugly embrace the end of the blade 38, while at thesame time permitting the slight lateral movement of the blade abovementioned.

From the construction described it will be apparent that the linkbetween the actuator and the toothed detector bar may be manually lockedand unlocked by shifting the handle 37 and that the handle serves alsoas a signal to show when the parts are locked together. It will also beseen that the locking member for the link 28 is positively held in itsactive position so that the link cannot become accidentally disengagedfrom the toothed detector bar. By mounting the locking member in theslot 35 of the link, proper directional movement of the locking memberis assured as it is thrown to and from looking position, and the footportion 36 of the locking member is accurately positioned and maintainedbeneath the projection of the toothed detector bar when the lockingmember is in locking position.

What is claimed is 1. In a warp stop mechanism for looms, thecombination of drop wires, a transversely movable toothed detector barhaving a lateral projection extending therefrom, an actuator, a linkmounted on the actuator and having a notch for engagement with saidlateral pro- ]ection, a locking member mounted on the link and having aportion adapted to extend across the entrance of said notch to retainthe lateral projection therein, and manually shiftable means comprisinga yieldable blade mounted on the link for movement into and out oflocking engagement with the locking member for positively holding saidlocking member in locking position.

2. In a warp stop mechanism for looms, the combination of drop wires, atransversely movable toothed detector bar having a pin extendingtherefrom, an actuator, a link pivotally mounted at one end on theactuator and having av notch at its opposite end for engagement withsaid pin, a locking member movably mounted on said link and providedwith a portion adapted to extend across the entrance of said notch toretain the pin therein, and means movable into and out of engagementwith said locking member to hold it in the pin engaging position.

3. In a warp stop mechanism for looms, the combination of a series ofdrop wires, a transversely movable toothed detector bar having a pinextending therefrom, an actuator, a connector between the actuator andtoothed detector bar having a notch for engagement with said pin, alocking member mounted on the connector for movement relative theretointo position to block the entrance of said notch to thereby retain thenotched portion of the connector in engagement with the pin, and meansadapted to engage the connector and locking member and operable to holdthe latter in its active position.

4. In a warp stop mechanism for looms, the combination of a series ofdrop wires, a transversely movable toothed detector bar having a pinextending therefrom, an actuator, a connector between the actuator andtoothed detector bar having a notch for engagement with said pin, alocking member mounted on the connector for movement relative theretointo position to block the entrance of said notch to thereby retain thenotched portion of the connector in engagement with the pin, meansadapted to engage the connector and locking member and operable to holdthe latter in its active position, and a projection upon the lockingmember forming a signal for indicating when the locking member is in itsactive position.

In testimony whereof, I have signed my name to this specification.

JULIUS E. MCCARVEY.

